Burst pipe: what to do first, in the ten minutes before the plumber picks up

If you cannot say right now where your main shutoff valve is, stop reading and go find it: Triple-I’s winter guide tells you to “check the location of the main water shutoff”, and so does this page.

Where is the main shutoff valve, and what if you cannot reach it?

At the water meter, or where the main line enters the house, in the Freezing and Bursting Pipes fact sheet’s words: in practice the street-facing basement wall, a utility room on a slab, or the meter box at the curb. Utah State University Extension adds the step people skip: teach adults and older children where it is and how to close it.

A valve only helps if someone is home to close it. That is the case for a motorised valve on the main, and the smart water shutoff valve review covers which units close on their own, which only alert, and why the install is a plumber job on a 3/4 to 1-1/4 inch main. If the water is coming from the water heater, the water heater leak guide finds the valve on the tank instead.

No source opened for this page describes valve types or a stuck valve, so that is left to the review and the plumber.

What comes first: the water, or the power?

The water, unless the water has already reached wiring. Ready.gov’s flood guidance: do not touch electrical equipment if it is wet or if you are standing in water, and turn off the electricity to prevent electric shock if it is safe to do so. The American Red Cross flood page repeats the first half, and the fact sheet repeats it for appliances.

“If it is safe to do so” is the whole rule. A dry panel in a dry room gets switched off. A panel in a flooded basement does not, and the call is to the utility or the fire department before the plumber. ESFI’s and CPSC’s pages were unreadable when this was written, so the federal and Red Cross wording stands in.

Situation by situation: the first action

What does the insurer need from the first hour?

A phone call and pictures, in that order. Triple-I’s claim guidance: phone your insurance professional immediately and ask whether you are covered, how long you have to file, and whether the claim will exceed the deductible. Then photograph or videotape the damage, take reasonable steps to protect the property from further damage, and keep damaged items until the adjuster has visited if you can.

Keep every receipt. Triple-I says to save receipts for what you spend, list the damaged items, and keep receipts for additional living expenses if the house is not livable, which most homeowners policies cover with proof of cost. Its winter storm article says standard homeowners policies generally cover water damage from burst pipes; the policy wording decides the rest.

This is where a leak sensor earns its keep: the smart leak detector review covers which carriers publish a credit and where the sensors go.

How do you thaw a frozen pipe without starting a fire?

With the faucet open, from the faucet end, and never with a flame. The American Red Cross lists the heat sources: an electric heating pad wrapped around the pipe, a hair dryer, a portable space heater kept away from flammable materials, or towels soaked in hot water. It names what not to use: a blowtorch, kerosene or propane heater, charcoal stove, or other open flame device. Indiana’s OUCC puts the same warning in capitals and calls it extremely dangerous and potentially deadly.

Utah State University Extension gives the order: main supply off, faucet on the frozen line open, thawing started at the faucet. The fact sheet adds the direction, toward the coldest section; Extension adds no boiling water, because of burns, and gradual heat so plastic faucet parts do not melt. OUCC closes it: turn the water back on very slowly while watching for leaks.

For a run that freezes every winter, the heat cable review covers self-regulating cable, and the outdoor faucet cover and sillcock review covers the hose bib. A well house has its own list on the well winter freeze checklist.

When is this a plumber’s job, not yours?

The Red Cross: when you cannot locate the frozen area, cannot reach it, or cannot thaw it. The fact sheet: when a faucet is open and no water comes out. Indiana’s OUCC goes further: no hair dryer thaw without talking to a plumber first, and never while standing in water.

A split pipe is always the plumber’s. Triple-I’s winter guidance says the quicker you shut off the water or direct your plumber to the problem, the better the chance of limiting the damage. Your part of that sentence is the valve and the address.

What should you do first?

1. Close the main shutoff valve, at the meter or where the line enters the house.
2. Cut the power only if the panel and the floor around it are dry; otherwise call the utility.
3. Open the faucets to drain the lines, and put buckets under the break.
4. Phone the insurer, then photograph or video the damage before moving anything.
5. Call a licensed plumber, and give them the location of the valve and the break.
6. If the pipe is frozen, not split: faucet open, hair dryer from the faucet end, no flame.

Frequently asked questions

Sources

1. Freezing and Bursting Pipes: How pipes freeze and burst, and what to do to prevent damage (PDF) (manufacturer or vendor document)
2. American Red Cross, Preventing and Thawing Frozen Pipes (manufacturer or vendor document)
3. American Red Cross, Flood Safety (manufacturer or vendor document)
4. Ready.gov, Floods (government or regulatory source)
5. Utah State University Extension, Advice to Prevent Frozen Pipes (university or extension service)
6. Indiana Office of Utility Consumer Counselor, Fast Facts: Preventing Frozen Pipes (PDF) (government or regulatory source)
7. Triple-I (Insurance Information Institute), How to file a homeowners claim (manufacturer or vendor document)
8. Triple-I, The homeowner's severe cold weather survival guide (manufacturer or vendor document)
9. Triple-I, Protect your home from winter weather (manufacturer or vendor document)
10. Triple-I, Winter storm alert: How to recover and rebuild with insurance (manufacturer or vendor document)